FS Single fuel pump conversion for LT5

[Flyman 27]

I will be leaving the country on Saturday & will not be back until Feb 5. I will not have access to the forum.
After you verify the info above, if the relays are new & the amperage is appripriate being drawn from the pump. The most likely culprit I can think of is the plastic fuel line clamp at the Fuel Pump. That would limit the max pressure the system would see.
Haven't seen one break yet, you would be the first, but it is more likely than a turbine pump failing.
IF The clamp has failed, replace it with a narrow steel clamp, don't overdo it & don't use a heavy clamp. You will break the pump trying to tighten it. The nozzle on the pump is not torque tollerant. Be very careful.
I am confident that you are experiencing one of the above issues. I have not seen one of these pumps fail yet and some guys have tons of miles on them.
IF you DO have a failed pump, I will replace it for you when I get back.
Please update theis forum or send me a PM on what you are finding.

These are the FP Relays I have been recommending and people have had good results with:
https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1